#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main() {
    int n, h, m, a = 0, b = 0;
    while (scanf("%d %d %d", &n, &h, &m) != EOF)
    {
        b = m / h;
        if (m % h != 0)
            b += 1;
        a = n - b;
        printf("%d", a);
    }
    return 0;
}